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  <body>
    <div class="paper">
      <div class="frames">
        <div class="frame" style="height: 400px"></div>
        <div class="frame" style="height: 400px; margin-top: 10px;"></div>
      </div>
      <div class="drawing-and-formula">
        <div style="margin-top:20px">
          <img class="drawing" src="../../img/elem/ElemGaussAperture.svg"/>
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        <div class="formulas-column" style="margin-left: 60px">
          <div style="margin-top:85px">
            \[ r^2 = x^2 + y^2 \]
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          <div style="margin-top:50px">
            \[ \alpha(r) = \alpha_0 + \frac { \alpha_2 \; r^2 } 2 \]
          </div>
          <div style="margin-top:50px">
            \[ M = \begin{bmatrix}
              1 & 0 \\
              -i \cfrac {\lambda \alpha_2} {2 \pi}  & 1 
              \end{bmatrix} \]
          </div>
        </div>
      </div>
      <div class="drawing-and-formula">
        <div style="margin-top:65px">
          <img class="drawing" src="../../img/elem/ElemGaussApertureLens.svg"/>
        </div>
        <div class="formulas-column" style="margin-left: 60px">
          <div style="margin-top:120px">
            \[ r^2 = x^2 + y^2 \]
          </div>
          <div style="margin-top:50px">
            \[ \alpha(r) = \alpha_0 + \frac { \alpha_2 \; r^2 } 2 \]
          </div>
          <div style="margin-top:50px">
            \[ M = \begin{bmatrix}
                1 & 0 \\
                - \cfrac {1} {F} - i \cfrac {\lambda \alpha_2} {2 \pi}  & 1 
                \end{bmatrix} \]
          </div>
        </div>
      </div>
    </div> <!-- end paper -->
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